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Seasonal variations and the influence of geomembrane liners on the levels of PBDEs in landfill leachates,sediment and groundwater in Gauteng Province,South Africa

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Emerging Contaminants 2017年第2期3卷 76-84页

作者： i.v.sibiya O.i.Olukunle O.J.Okonkwo Tshwane University of Technology Department of EnvironmentalWater and Earth SciencesPrivate Bag X680PretoriaSouth Africa

in the present study,the seasonal concentrations of polybrominated diphenyl ethers(PBDEs)in leachate and sediment samples,and the influence of geomembrane liners on PBDE levels and the extent of their infiltration into groundwater on selected landfill sites in Gauteng Province,South Africa were *** and sediment samples were collected from seven operational landfill sites namely:Goudkoppies,Robinson Deep,Marie Louis,Soshanguve,Onderstepoort,Hatherly and Garankuwa from Johannesburg and Pretoria,in winter and *** samples were collected from monitoring boreholes from two landfill ***-liquid and Soxhlet extraction techniques were employed for the extraction of leachate and groundwater,and sediment respectively using *** extracted samples were subjected to column clean up and,thereafter,analysed using gas chromatographyemass spectroscopy(GC-MS).PBDEs selected for the study were:BDE-17,-28,-47,-100,-99,-153,-154,-183 *** P9PBDE concentrations in leachate samples for winter and summer ranged from 0.316e1.36 ng L-1 and 0.560e1.08 ng L-1 *** P9 PBDE concentrations obtained for sediment in winter and summer were 3.00e4.91 ng g-1 and 2.50e3.71 ng g-1 *** samples exhibited higher(pions for both leachate and sediment samples compared to summer *** trend was attributed to high precipitation rate in summer which may have infiltrated into the landfills,subsequently diluting the leachate and sediment *** contrast,the winter period is generally dry and PBDEs are,therefore,more likely to be *** concentrations of PBDEs in leachate and sediment samples were higher in landfill sites with geomembrane liners compared to those without *** samples taken from the vicinity of selected landfill sites without geomembrane liners exhibited high concentrations of P9PBDEs,indicating possible migration of PBDEs from landfill site into ***

关键词： Seasonal trend PBDEs concentrations Landfill leachates Sediment Groundwater Geomembrane liners

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